Secrets unravel, and new dangers emerge. World-altering secrets are revealed in this thrilling fourth installment as Ryan and J.B. interrogate the mysterious figure who’s been menacing the Troopers! And while Ryan finally gets some long overdue answers about what happened to his father, more alarming revelations surface about Grimlord’s growing power. With time running out, and rumors of a dangerous new antagonist called Dark Heart in the mix, can Ryan save Kaitlin, Earth...and maybe even his family?